Bio Barracuda slipper made of dark gray recycled felt. Anatomic sole made of soft cork. Rubber sole with waves made with natural colored recycled cork shavings. Outer material: felt Lining: felt Sole: TR and recycled cork This article is #animalfree Suitable for vegans * Approved by PETA vegans. The model we use to make the slipper is anatomical, being a little wider than other types of footwear. If you are hesitating between two sizes, we recommend that you choose the smaller one.